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Finding the Fourth Proportional to 139,236.66, 192,135.78 and 81,878.22

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Solution

The fourth proportional to 139,236.66, 192,135.78 and 81,878.22 is: 112,985.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,236.66 : 192,135.78 = 81,878.22 : x
  2. Step 2: Convert to fraction form
    139,236.66/192,135.78 = 81,878.22/x
  3. Step 3: Cross multiply
    139,236.66x = 192,135.78 × 81,878.22
  4. Step 4: Simplify right side
    139,236.66x = 15,731,735,664.71
  5. Step 5: Solve for x
    x = 15,731,735,664.71/139,236.66
  6. Step 6: Final answer
    x = 112,985.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.